A shallow.
If you focus enough, anything can be a shallow.
That's the basis of the technique. His existence, the reason why he managed to reappear.
And yet he lost.
Technique was nice, but his sword wasn't.
And after dying yet again...
Sasaki Kojirou woke up as a victim of Teleport Incident with a simple long nodachi on his side yet again and...
A sleeping female Miyamoto Musashi on top of him, dreaming about udon.
Mushoku Tensei fanfic with no harem RAHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
Btw before you ask, Sasaki is from UBW route since I mentioned him losing due to his sword's quality (PEAK BULLSHIT BUT UNDERSTANDABLE) and Musashi is the one travelling through worlds in Fate Grand Order before meeting her demise in Lostbelt 5.2.
I love Fate lore. Mushoku tensei is also one of my fav worlds... Yeah, just world. The author fucked up most of my fav characters in it and even if I reread this shit multiple times, I still cannot care about Rudeus.